Oischarge

FIGURE 14 Annual eductor (Schutte and Koerting)

example 4 A centrifugal pump with a capacity of 100 gpm (22.7 m3/h) at a total discharge head of 150 ft (45.7 m) and requiring 10 ft (3.05 m) NPSH is available to operate an eductor to pump water at 50 ft (15.2 m) below grade. Find the quantity of water that can be delivered at 60 lb/in2 (4.1 bar) gage (see Figure 17).

Solution The available operating head is 138.6 ft + 50 ft — frictional loss (42.2 + 15.2 - frictional loss). As a first assumption, the frictional loss is ignored and the head ratio is 188.6/40.83 = 4.62 (57.4/12.38 = 4.62). From Figure 2 at NPSH 33.6 ft (10.24 m), e = 0.9 and

Rw = Rq = 0.9 2462 — 1 = 0.934 (from Eqs. 5 and 6)

TABLE 7 Relative capacities (flow rates) of annual eductors

Capacity of standard 1;j-in (38.1-mm) mixing eductor, 5 lb/in2 (0.34 bar) gage discharge pressure

30 (2.1) I0 (2.8) 60 (I.1) 80 (5.5) 100 (6.9) 2.6 (0.07) 7.1(0.20) 17.9(0.51) 22.0(0.62) 23.8(0.67)

Motive pressure, lb/in2(bar) gage Entrainment, ft3/h (m3/h)

Motive flow, gpm 12.7(2.88) 1I.6(3.31) 17.9d.06) 20.7 (I.70) 23.1 (5.2I)

Relative capacities of standard sizes

Size, in (mm) Capacity ratio

1I (31.8) 12 (38.1) 2 (50.8) 22 (63.5) 0.62 1.00 1.I3 2.86

3 (76.2) I.76

I(102) 8.80

Source: Schutte and Koerting.

Source: Schutte and Koerting.

FIGURE 15 Multinozzle eductor (Schutte and Koerting)

FIGURE 15 Multinozzle eductor (Schutte and Koerting)

End of Days Apocalypse

End of Days Apocalypse

This work on 2012 will attempt to note them allfrom the concepts andinvolvement by the authors of the Bible and its interpreters and theprophecies depicted in both the Hopi petroglyphs and the Mayan calendarto the prophetic uttering of such psychics, mediums, and prophets asNostradamus, Madame Blavatsky, Edgar Cayce, and Jean Dixon.

Get My Free Ebook


Post a comment